Ensure all links have trailing slashes (v1 docs)

[chalin]

• Followup to Make full link checking the default, including external links #906, of adding trailing slashes where necessary, but for v1 docs

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[yurishkuro]

no objection but what's wrong with links not having trailing slash? they still work.

[chalin]

no objection but what's wrong with links not having trailing slash? they still work.

It follows the general guidance of using canonical paths in our docs when htmltest is the link checker. That is, a path (or more generally URL), is canonical if the HTTP status of requesting it is 200, not 30X.

Admittedly, for the older docs, it might not have been necessary, but it was relatively easy to fix using regexes.